Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
danh tai » doanh tai, dinh tai, hanh tai
ky tang » ky nang, kho tang, ky trong
ky dang » ky nang, ky danh
truc va » thuc va, thuc vat, trung va
va danh » va dinh, va dan, va hanh
tai cua » thai cua, tai cuc, tri cua
va cau » van cau, va cac, va dau
cua su » qua su

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (toc sach)) ((ky tang) or (ky dang)) xa hoi. lieu va cau truc va danh tai cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ((ky tang) OR (ky dang)) xa hoi. lieu va cau truc va danh tai cua su.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ((ky tang) or (ky dang)) xa hoi. lieu va cau truc va danh tai cua su*.